Speciation, It occurs when populations of the same species become isolated, either geographically or reproductively, and undergo genetic changes over time, Allopatric, Due to geographic separation, Sympatric, Within the same environment, peripatric, In small isolated populations, Example of allopatric, Finches in Galapagos Islands, Example of Sympatric, Lake Victoria cichlid, Example of peripatetic, Polar bears, Richness, Number of different species in a given ecosystem, evennes, Describes how individuals are distributed among those species.

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